PSYC 301 Lecture Notes - Lecture 7: John Hancock Tower, Skateboarding
Document Summary
Example: find the work done if the force is 45. 0 n, the angle is 50. 0 degrees, and the displacement is 75. 0 m. Example: accelerating a crate (p. 157) truck accelerating at 1. 50m/s2. Mass of crate is 120kg and does not slip. Example: (p. 178): three forces act on a skateboarder coasting down a ramp: her weight (675 n), a frictional force (125 n), and a normal force (612 n). Determine the net work done by the three forces when she coasts for a distance of 9. 2 m. Work-energy: when a net force acts on a body and makes it move, the work done, w, by that force changes the kinetic energy of the body by, Example 5: a 58kg skier is coasting down a 25o slope. A kinetic frictional force of 71 n opposes her motion. Near the top of the slope, the skier"s speed is vi=3. 6 m/s.
